■ On Aquatic Carnivorous Coleoptera or DytiscidcB. 813 



1443. Hydroporus tinctus, Clk., Ann. Nat. Hist. 1862, X, p. 326. Britain. 



" H. oblongo-ovalis, subpaiallelus, sat convexus, post medium paulo latior, ad apicem modice et rotunde 

 productus, crebi-e punctulatus leviter pubescens, subopacus, niger, obscure rufo-notatus ; capite inter 

 oculos undique late et clistincte depresso, sparsLm punctulato, ad apicem rufo tincto; tliorace antice emargiiiato, 

 lateribus leviter rotundatis, basi sinuata ad medium (soitelli regione) angulata, sparsim et foi-titer 

 punctato, antice juxta marginem transverse punctato-striato, ad basin plus minus transverse depresso, ad 

 baseos angulos plus fortiter plerumque foveolato, nigro; elytris thorace lateribus, cum thoracis margiue 

 angulum obtusum formautibus, post medium latioribus, leviter punctatis, sparsim pubescentibus, nigris, 

 fascia lata insequali apud humeros, vitta marginali (post medium in maculam triangularem dilatata) haud 

 apicem attingente, rufis vel rufo-fuscatis, hse maculse aliquando obsoletee sunt, aliquando omnino absunt ; 

 corpore subtus nigro; antennis fusco-nigris ; pedibus fusco-nigris, tarsonim artieulis anteriorum latis." 



" Magnitudine variat. Long. corp. 1|-14, lat. 4." 



I believe this is a variety of Dytiscus palustris (No. 61 2), but it may possibly be H. incognitus (No. 611). 

 — D, S. 



1444. Hydroporus truucatus, Mann., Bull. Mosc, 18.53, III, p. 162. Russian North America. 



" Elongato-ovalis, subellipticus, depressiusculus, subtilissime et creberrime recticulato-strigulosus, tenue 

 gi'iseo-pubescens ; capite rufo-ferrugineo, in fronte infuscato ; thorace antrorsum angustato ibique 

 latitudiue postica dimidio angustiore, lateribus haud rotundatis ferrugineis, postice aequali, supra 

 scutellum rotundatim producto ; elytris basi et lateribus obsolete, epipleui-is vero laete ferrugineis, apice 

 oblique truncatis ; antennis pedibus abdomineque pallide testaceis. Longit. 2^ lin., latit. 1 lin." 



This is not alluded to byCrotcli either in his Check List, or "Eevisiou of N. American Dytiscidse." — 1). S. 



1445. Hydroporus undecimlinellus, Fairm., Pet. Nouv., II, p. 141. North Africa. 



" Long. 4 m.m. — H. cerisyi certe afEnis, sed minor, glaber, antice posticeque magis attenuatus, 

 prothorace basi minus lato, elytrorum stria suturali minus obsoleta et liueis nigris basi magis abbreviatis. 

 Tougourt." 



This is probably a variety of Hydroporus ceresyi (No. 490). — D. S. 



1446. Hydroporus undecimmaculatus, Clk., Journ. Ent., I, p. 412. Australia. 



" Ovatus, latus, subdepressus, crebre punctatus niger vel fusco-niger, ruto-fusco maculatus. Long. corp. 

 vix. 14 lin., lat. vix. ^ lin." 



" Ovate, broad, of greatest breadth behind the middle, subattenuated towards the apex ; very thickly 

 punctate, of a reddish, dull black colour, with rufous maculations ; head short, broad ; near the inner 

 margins of the eyes are two shallow depressions ; thorax broad, subparallel, the anterior angles largely 

 rounded ; the surftice in front of the middle is laterally subdepressed ; the sides are broadly marginate, 

 the marginations being defined by a sharp, deeply-cut fovea extending from the front to the line of the 

 base ; at the basal line are three suffused circular markings of fusco-rufous, one on either .side, and a thu-d 

 medial ; elytra broad, with four lateral subcircular fusco-rufous markings, three lateral at the emargina- 

 tion, and a fourth opposite the one nearest the base ; legs and antenuse rufo-fuscous." 



This is a very distinct s]iecies, the sides of the thorax are elevated so as to give it some resemblance to 

 our European H. moestus (No. 456). — D. S. 



1447. Hydropoi-us (Coelambus) unguicularis, Crotch, Tr. Am. Ent. Soc. V, p. 73. North America. 



" Elongate ovate, fulvous, bi-east and abdomen black ; head finely punctulate with smooth spaces ; thorax 

 transverse, sides slightly rounded, 2>unctulate, disc nearly smooth, with a small black central mark and 

 a linear fovea, base and apex faintly black ; elytra regularly elongate-ovate, closely and finely punctate 



5 M 2 



